Finding the Fourth Proportional to 21,404.34, 29,538.54 and 11,972.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,404.34 : 29,538.54 = 11,972.88 : x
2. Step 2: Convert to fraction form
   21,404.34/29,538.54 = 11,972.88/x
3. Step 3: Cross multiply
   21,404.34x = 29,538.54 × 11,972.88
4. Step 4: Simplify right side
   21,404.34x = 353,661,394.80
5. Step 5: Solve for x
   x = 353,661,394.80/21,404.34
6. Step 6: Final answer
   x = 16,522.88